В треугольнике \(\displaystyle ABC\) угол \(\displaystyle C\) равен \(\displaystyle 90^{\circ} {\small,}\) \(\displaystyle \sin \angle B=\frac{4}{9} {\small,}\) \(\displaystyle AB=18 {\small.}\) Найдите \(\displaystyle AC {\small.}\)
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